Hill Climb Racing 2 - Sequel to the most addictive and entertaining physics based driving game ever! And it's free!
OpenTTD - An open-source clone of the classic game ...
Alto's Adventure - An endless snowboarding odyssey
Game Dev Tycoon - Game Dev Tycoon is an addictive, Strategy, Business Simulation, and Single-player video game developed and published by Greenheart Games.
Happy Wheels - The fun Happy Wheels game features several levels that you have to get through using a variety of wheeled vehicles. There are obstacles that are quite challenging. Read more about Happy Wheels.
RollerCoaster Tycoon Classic - Create and run amazing parks on your iPhone or Android.